It seems the consensus is that it's "gangster behavior", not serial killer behavior. I will never understand why people like him, who is talented enough to play in the NFL and get crazy rich, does such crazy things. Allegedly, because I don't know more than what I've read about this case, he was hooked on angel dust. I was shocked to see that come up again and again, because I've really not heard about angel dust in decades. I didn't even know you could still get it. And, of course, he smoked pot, but the whole angel dust thing really surprises me.
Maybe it's a thing in other places, but it's not where I live.